Radar

Radar is a system that uses radio waves to determine the distance (ranging), direction (azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations and terrain. The term RADAR was coined in 1940 by the United States Navy as an acronym for "radio detection and ranging". The term radar has since entered English and other languages as an anacronym, a common noun, losing all capitalization.

thumb|Commercial FM broadcasting transmitter at radio station [[WDET-FM, Wayne State University, Detroit, US. It broadcasts at 101.9 MHz with a radiated power of 48 kW.]]

service provided for the purpose of preventing collisions between aircraft, and on the manoeuvring area between aircraft and obstructions; and expediting and maintaining an orderly flow of air traffic

military technology to make personnel and materiel less visible

device for generating microwaves

geophysical method

radar used to locate and monitor meteorological conditions

thumb|right|120px|An Ontario Highway 407 toll transponder circa 2009

computer-controlled array antenna in which the beam of radio waves can be electronically steered to point in different directions

type of radar equipment

array of antennas creating a steerable beam

right|260px|thumbnail|Geodesic radomes at the Misawa Air Base|Misawa Security Operations Center, Misawa, Japan thumb|Spherical radome mounted atop the mainmast of a Type 45 destroyer thumb|A Boeing E-3 Sentry, showing its rotodome mounted above the fuselage A radome (a portmanteau of "radar" and "dome") is a structural, weatherproof enclosure that protects a radar antenna. The radome is constructed of material transparent to radio waves. Radomes protect the antenna from weather and conceal antenna electronic equipment from view. They also protect nearby personnel from being accidentally struck

reflective and observational astronomy that uses radar to map the surfaces of bodies in the solar system

designation for a band of microwave frequencies from approximately 8 to 12 GHz

sensor to detect police radars

form of radar system

systems that detect the radio emissions of radar systems

radar system that can find targets at 100s–1000s of kilometres, beyond the radar horizon

1942 British Combined Operations raid during World War II

passive collection of radar beams

device that uses radar to determine a vehicle's speed

provides for radar coverage in three dimensions

transmitter-receiver associated with a fixed navigational mark

emission of radio signals to interfere with radar operation

antenna in which the beam of radio waves can be electronically steered to point in different directions

ships which use stealth technology

type of radar where a known stable frequency continuous wave radio energy is transmitted

shipborne multi-function radar

transponder intended for emergency use at sea

RAM Technology

250px|thumb|right|Typical ionogram indicating an [[F2 layer critical frequency (foF2) of approximately 5.45 MHz.]] thumb|right|An example of an ionosonde system displaying an ionogram

radar sensor that illuminates a large portion of space with an electromagnetic wave and receives back the reflected waves from targets within that space

aspect of history

new radar technology

marine radar capability that can create tracks using radar contacts

radar system

retroreflector for radar applications

mathematical number sequence

microwave network module

proposed aircraft stealth technology using ionized gas to reduce the radar cross-section of an aircraft

type of radar display

system used in radar to improve accuracy

single-pulse radar system

type of antenna used for various communication

radar mode

visual display of a radar signal

American low-level airborne ground surveillance system

Norwegian technology company

Early radar technique

lightweight surveillance radar system

radar to detect aircraft and vehicles on the surface of an airport

measures an aircraft's height above the terrain

smart antenna with multi channels digital beamforming